I have an SL2 and although the lightest option it is very fragile, if your careful with it it will last a long time but if not handing it with kids gloves it is easily damaged. The SLX's are very robust and will last a long time if taken care of. The extreme poles are nearly as light as the SL2's but seem just as strong as the SLX. I've seen the test versions of the extreme's and they seem to be hard wearing as well.
The extreme is an interesting design and is as much a cross between a telescopic and modular pole that you can get. The main length of each section is a reduced wall thickness to that the clamping points are only at the top and bottom. This lightens the pole and I believe from looking at the design will reduce wear as when the pole is closed there will be voids between the sections as opposed to carbon rubbing on carbon or indeed carbon grit and carbon. The only downside that I can see is that you can only use full lengths of pole (although on the 48ft version the bottom of the pole is fully adjustable).
This range of poles is unbelievably rigid and light. The only reason I see for having the SL2 (modular) now it for very long runs of windows at the same height. You can't extend a 48ft modular pole in less than a minute but you can with an SLX extreme.
Simon.
is the diameters smaller?
sound like they are smaller and with thinner walls
have they had to make it thicker at the ends for the clamps to fit?
if it is like that
it wont be more rigid than thicker poles with a larger diameter
might appear that way if its light, but it wont be
it also sounds like its been made for the extreme brush only
stick a vikan on it, tell us what happens
Give it up Ewan.
How many more times do we have to prove that you haven't a clue what you're talking about!

:
